<template>
  <view @touchstart="handleTouchstart" @touchend="handleTouchend">
    <slot></slot>
  </view>
</template>

<script>
export default {
  data() {
    return {
      startTime: 0,
      startX: 0,
      startY: 0,
    };
  },
  methods: {
    // 触屏按下事件
    handleTouchstart(event) {
      this.startTime = Date.now();
      this.startX = event.changedTouches[0].clientX;
      this.startY = event.changedTouches[0].clientY;
    },
    // 触屏离开事件
    handleTouchend(event) {
      const endTime = Date.now();
      const endX = event.changedTouches[0].clientX;
      const endY = event.changedTouches[0].clientY;
      // 判断按下时长
      if (endTime - this.startTime > 2000) {
        return;
      }
      //判断滑动方向和距离
      let direction = "";
      if (
        Math.abs(endX - this.startX) > 10 &&
        Math.abs(endY - this.startY) < 10
      ) {
        direction = endX - this.startX > 0 ? "right" : "left";
      } else {
        return;
      }
      // console.log(direction);
      this.$emit("swiperAction", { direction });
    },
  },
};
</script>

<style></style>
